<form class="form-horizontal signin">
  <div class="form-group">
    <div class="col-md-offset-3 col-md-6">
      <input type="email" class="form-control" id="username" placeholder="电子邮箱地址">
    </div>
  </div>
  <div class="form-group">
    <div class="col-md-offset-3 col-md-6">
      <input type="password" class="form-control" id="password" placeholder="密码">
    </div>
  </div>
  <div class="form-group">
    <div class="col-md-offset-3 col-md-6">
      <div class="checkbox">
        <label>
            <input type="checkbox"> 记住我
          </label>
      </div>
    </div>
  </div>
  <div class="form-group">
    <div class="col-md-offset-3 col-md-6">
      <button type="submit" class="btn btn-default btn-block">登录</button>
    </div>
  </div>
  <div class="form-group">
    <div class="col-md-offset-3 col-md-6">
      <a href="javascript://">忘记密码</a> &nbsp;|&nbsp;
      <a href="javascript://">首次登录</a>
    </div>
  </div>
</form>
